Synthetic leather Breathable, extreme durability and lightweight. Nylon Mesh upper Extreme ventilation and durability. Ergonomic thermoplastic molded heel Good fit and enhanced durability. Ratchet closure and velcro straps Micro adjustment and better support in vertical thrust. Main strap adjustable with velcro Easy to get the perfect fit without pressure pointDual material Carbon and nylon outsole with patented multivent system Multivent outsole providing comfort under all weather conditions. Visual display of cleat's position Compatible with SPD, SPD SL, TIME, LOOK and SPEED PLAY cleats. Weight size 411 shoe 303 g11 oz. Ergoair Interchangeable.